diff mbox series

[bpf-next,2/6] libbpf: add internal helper to load BTF data by FD

Message ID 20201119232244.2776720-3-andrii@kernel.org (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series libbpf: add support for kernel module BTF CO-RE relocations | expand

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Commit Message

Andrii Nakryiko Nov. 19, 2020, 11:22 p.m. UTC 
Add a btf_get_from_fd() helper, which constructs struct btf from in-kernel BTF
data by FD. This is used for loading module BTFs.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
---
 tools/lib/bpf/btf.c             | 61 +++++++++++++++++++--------------
 tools/lib/bpf/libbpf_internal.h |  1 +
 2 files changed, 36 insertions(+), 26 deletions(-)

Comments

Martin KaFai Lau Nov. 20, 2020, 6:20 p.m. UTC | #1 
On Thu, Nov 19, 2020 at 03:22:40PM -0800, Andrii Nakryiko wrote:
[ ... ]

> +int btf__get_from_id(__u32 id, struct btf **btf)
> +{
> +	struct btf *res;
> +	int btf_fd;
> +
> +	*btf = NULL;
> +	btf_fd = bpf_btf_get_fd_by_id(id);
> +	if (btf_fd < 0)
> +		return 0;
It should return an error.

> +
> +	res = btf_get_from_fd(btf_fd, NULL);
> +	close(btf_fd);
> +	if (IS_ERR(res))
> +		return PTR_ERR(res);
> +
> +	*btf = res;
> +	return 0;
>  }
>
Andrii Nakryiko Nov. 20, 2020, 6:25 p.m. UTC | #2 
On Fri, Nov 20, 2020 at 10:20 AM Martin KaFai Lau <kafai@fb.com> wrote:
>
> On Thu, Nov 19, 2020 at 03:22:40PM -0800, Andrii Nakryiko wrote:
> [ ... ]
>
> > +int btf__get_from_id(__u32 id, struct btf **btf)
> > +{
> > +     struct btf *res;
> > +     int btf_fd;
> > +
> > +     *btf = NULL;
> > +     btf_fd = bpf_btf_get_fd_by_id(id);
> > +     if (btf_fd < 0)
> > +             return 0;
> It should return an error.
>

That would break the original behavior with (ret == 0 && btf == NULL),
but I think it's more consistent, so I'll fix this and will add Fixes:
tag.

> > +
> > +     res = btf_get_from_fd(btf_fd, NULL);
> > +     close(btf_fd);
> > +     if (IS_ERR(res))
> > +             return PTR_ERR(res);
> > +
> > +     *btf = res;
> > +     return 0;
> >  }
> >
diff mbox series

Patch

diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index 8ff46cd30ca1..541696d9aed6 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -1318,35 +1318,27 @@  const char *btf__name_by_offset(const struct btf *btf, __u32 offset)
 	return btf__str_by_offset(btf, offset);
 }
 
-int btf__get_from_id(__u32 id, struct btf **btf)
+struct btf *btf_get_from_fd(int btf_fd, struct btf *base_btf)
 {
-	struct bpf_btf_info btf_info = { 0 };
+	struct bpf_btf_info btf_info;
 	__u32 len = sizeof(btf_info);
 	__u32 last_size;
-	int btf_fd;
+	struct btf *btf;
 	void *ptr;
 	int err;
 
-	err = 0;
-	*btf = NULL;
-	btf_fd = bpf_btf_get_fd_by_id(id);
-	if (btf_fd < 0)
-		return 0;
-
 	/* we won't know btf_size until we call bpf_obj_get_info_by_fd(). so
 	 * let's start with a sane default - 4KiB here - and resize it only if
 	 * bpf_obj_get_info_by_fd() needs a bigger buffer.
 	 */
-	btf_info.btf_size = 4096;
-	last_size = btf_info.btf_size;
+	last_size = 4096;
 	ptr = malloc(last_size);
-	if (!ptr) {
-		err = -ENOMEM;
-		goto exit_free;
-	}
+	if (!ptr)
+		return ERR_PTR(-ENOMEM);
 
-	memset(ptr, 0, last_size);
+	memset(&btf_info, 0, sizeof(btf_info));
 	btf_info.btf = ptr_to_u64(ptr);
+	btf_info.btf_size = last_size;
 	err = bpf_obj_get_info_by_fd(btf_fd, &btf_info, &len);
 
 	if (!err && btf_info.btf_size > last_size) {
@@ -1355,31 +1347,48 @@  int btf__get_from_id(__u32 id, struct btf **btf)
 		last_size = btf_info.btf_size;
 		temp_ptr = realloc(ptr, last_size);
 		if (!temp_ptr) {
-			err = -ENOMEM;
+			btf = ERR_PTR(-ENOMEM);
 			goto exit_free;
 		}
 		ptr = temp_ptr;
-		memset(ptr, 0, last_size);
+
+		len = sizeof(btf_info);
+		memset(&btf_info, 0, sizeof(btf_info));
 		btf_info.btf = ptr_to_u64(ptr);
+		btf_info.btf_size = last_size;
+
 		err = bpf_obj_get_info_by_fd(btf_fd, &btf_info, &len);
 	}
 
 	if (err || btf_info.btf_size > last_size) {
-		err = errno;
+		btf = err ? ERR_PTR(-errno) : ERR_PTR(-E2BIG);
 		goto exit_free;
 	}
 
-	*btf = btf__new((__u8 *)(long)btf_info.btf, btf_info.btf_size);
-	if (IS_ERR(*btf)) {
-		err = PTR_ERR(*btf);
-		*btf = NULL;
-	}
+	btf = btf_new(ptr, btf_info.btf_size, base_btf);
 
 exit_free:
-	close(btf_fd);
 	free(ptr);
+	return btf;
+}
 
-	return err;
+int btf__get_from_id(__u32 id, struct btf **btf)
+{
+	struct btf *res;
+	int btf_fd;
+
+	*btf = NULL;
+	btf_fd = bpf_btf_get_fd_by_id(id);
+	if (btf_fd < 0)
+		return 0;
+
+	res = btf_get_from_fd(btf_fd, NULL);
+	close(btf_fd);
+	if (IS_ERR(res))
+		return PTR_ERR(res);
+
+	*btf = res;
+	return 0;
 }
 
 int btf__get_map_kv_tids(const struct btf *btf, const char *map_name,
diff --git a/tools/lib/bpf/libbpf_internal.h b/tools/lib/bpf/libbpf_internal.h
index d99bc847bf84..e569ae63808e 100644
--- a/tools/lib/bpf/libbpf_internal.h
+++ b/tools/lib/bpf/libbpf_internal.h
@@ -155,6 +155,7 @@  int bpf_object__section_size(const struct bpf_object *obj, const char *name,
 			     __u32 *size);
 int bpf_object__variable_offset(const struct bpf_object *obj, const char *name,
 				__u32 *off);
+struct btf *btf_get_from_fd(int btf_fd, struct btf *base_btf);
 
 struct btf_ext_info {
 	/*